How Likely Is a Tornado in Washington County, IA?
Washington County, IA: what NOAA's tornado record says
Washington County has recorded 25 tornado touches in NOAA's 76-year database, a rate of roughly one every 3 years - our Elevated band. Put another way: Washington County sees more tornado activity than 60% of US counties. Within Iowa alone, Washington County ranks 78 of 99 counties for tornado frequency.
Beyond the frequency band: violent history
1 tornado touching Washington County reached violent (EF4-5) strength since 1950. That single fact carries more weight for the shelter decision than the county's overall frequency band.
The dollar figure Washington County's rating leads to
Cost nationally: $2,890-$13,280, about $7,645 typical. Iowa has no state rebate program confirmed here; FEMA's underlying 75% cost-share exists nationwide, but applying through a state program is what usually makes it real, and none was found for Iowa this pass.
What a direct hit isn't required for
22,631 people live in Washington County, and a tornado outbreak's power loss usually reaches far more of Iowa than the tracks themselves touch. A portable battery unit is the faster, no-fuel way to bridge that outage.
What this number is, and is not
One caveat before relying on Washington County's number: it is county-wide, and it covers about 569 square miles, so a single touch counts the same as one in a county a fraction of that size. Weaker pre-1990s tornadoes are also documented as undercounted in NOAA's own record. Washington County has about 22,631 residents.